Where are ion channels mostly found?

Ion channels are present in nearly every living organism, ranging from viruses and bacteria to plants and animals. They are also found in all cell types within the human body. Ion channel receptors are typically composed of multiple protein subunits that are found in the cell's plasma membrane. These proteins organize themselves to create a channel or pore that spans from one side of the membrane to the other, allowing the passage of ions. The most prevalent type of ion channels are those that primarily allow the passage of potassium ions (K+). These potassium channels play a crucial role in regulating the membrane potential across all cell membranes by significantly increasing the permeability of the plasma membrane to potassium ions compared to other ions.